linux-kernel - Re: [PATCH v2] PCI: VMD: ACPI: Make ACPI companion lookup work for VMD bus

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Date:   Thu, 2 Sep 2021 17:57:41 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Jon Derrick <jonathan.derrick@...el.com>,
        Linux PCI <linux-pci@...r.kernel.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        "Wang, Wendy" <wendy.wang@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        David Box <david.e.box@...ux.intel.com>
Subject: Re: [PATCH v2] PCI: VMD: ACPI: Make ACPI companion lookup work for
 VMD bus

On Thu, Aug 26, 2021 at 8:24 PM Jon Derrick <jonathan.derrick@...el.com> wrote:
>
>
>
> On 8/25/21 9:26 AM, Rafael J. Wysocki wrote:
> > On Wed, Aug 25, 2021 at 5:00 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
> >>
> >> On Wed, Aug 25, 2021 at 11:02:47AM +0000, Wang, Wendy wrote:
> >>> Hi Rafael,
> >>>
> >>> Tested this PATCH v2 against intel next v5.12 kernel on ADL-S NVME and SATA storages:
> >>>
> >>> cat /sys/devices/pci0000\:00/0000\:00\:0e.0/firmware_node/path
> >>> \_SB_.PC00.VMD0
> >>>
> >>> 10000:e0:17.0 SATA controller: Intel Corporation Device 7ae2 (rev 11)
> >>> 10000:e0:1d.0 System peripheral: Intel Corporation Device 09ab
> >>> 10000:e0:1d.4 PCI bridge: Intel Corporation Device 7ab4 (rev 11)
> >>> 10000:e1:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller PM9A1/PM9A3/980PRO
> >>>
> >>> [ 6193.658074] ahci 10000:e0:17.0: PCI PM: Suspend power state: D3hot
> >>> [ 6193.658156] nvme 10000:e1:00.0: PCI PM: Suspend power state: D3hot
> >>> [ 6193.710883] pcieport 10000:e0:1d.4: PCI PM: Suspend power state: D3cold
> >
> > This doesn't happen without using the ACPI companion object (the
> > deepest power state you can get then is D3hot) AFAICS.
> >
> >>> [ 6193.730318] vmd 0000:00:0e.0: PCI PM: Suspend power state: D3hot
> >>>
> >>> cat /sys/kernel/debug/pmc_core/substate_residencies
> >>> Substate   Residency
> >>> S0i2.0     0
> >>> S0i2.1     13862128
> >>>
> >>> Thanks!
> >>
> >> I guess (given Rafael's response) that this is a positive test result,
> >> i.e., you see the desired behavior with this patch?
> >
> > So yes.
>
> LGTM then
>
> Acked-by: Jon Derrick <jonathan.derrick@...el.com>

Thank you!

It doesn't look like there are any concerns regarding this patch, so
I'll queue it up for merging next week.